In celiac disease, the body reacts to gluten (in wheat and gluten-like proteins in rye and barley) resulting in damage to the small intestine. This limits the intestine's ability to absorb some nutrients. Typically, people with celiac disease have loose stools, bloating, abdominal pain or discomfort, weight loss, poor weight gain in pediatrics, and malnutrition.
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2

Yes:
The antibody test is likely to remain positive for a long time after going on gluten free diet. The test for hla antigen will certainly remain unchanged. See this site for more info.
http://digestive.niddk.nih.gov/ddiseases/pubs/celiactesting/.
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3

Varies:
There are a number of tests that are used to screen for celiac disease. The tissue transglutaminase IGA is one of the more dependable, usually ordered with an IGA level.There are others, and the delicate nature of the tests requires that they be done in a facility that does them often to be reliable. Local hospitals rarely have the volume to invest in the specialized equipment.
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4

Very unlikely:
The gold standard of celiac disease is the small bowel biopsy. Blood tests, if positive are helpful. You don't provide enough clinical detail to give you more specific advice. Denmark has several excellent hospitals and medical schools.I suggest you should be evaluated in a tertiary medical center.l
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5

Maybe:
Your question does not provide enough info to confirm or exclude need for a celiac screening. It is a real problem with some subtle symptoms and effects. Screening is simple but confirmation requires an intestinal biopsy.You should have it confirmed before trying a gluten free lifestyle, which has a cult like following. True celiacs have other associated risks that need to be explored.
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6

TTG IgA , others :
Arguably the most accurate is the ttg IgA level. In those who are IgA deficient, i believe a dpg igg is the best. Others include anti-endomysial antibodies. The gold standard is duodenal biopsies obtained during endoscopy.
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10

Anti-tTG first:
In suspected celiac disease / gluten enteropathy / sprue, the cheap screening test is the anti-ttg (tissue transglutiminase); followup may include the more costly IgA anti-endomysial antibdies (ema), biopsy of the gut, and/or a trial of a gluten-free diet. No one knows how common celiac disease really is; what matters is whether gluten elimination ultimately helps you.
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